I am working to create a module that views and updates clients. I am trying to fill a dropdownlist using data from a table. I am getting an error that says: Error: is currently unavailable.DotNetNuke.Services.Exceptions.ModuleLoadException: Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource.  I am using the TaskManager series as a template for developing this module and I am still shakey with C# code. Below is what I have and I am requesting some help in creating and accessing the proper data type list to fill a dropdownlist.

 THE METHOD AND CLASS BELOW:
public  static ParentList GetParentDropDownList() { return CBO.FillObject<ParentList>(DataProvider.Instance().GetParentDropDownList()); }

public class ParentList { /// <summary> /// the parent's name of a given player /// </summary> public string Parent { get; set; } /// <summary> /// The junior player's main parent-guardian /// </summary> public int ParentID { get; set; } }

THE ERROR OCCURS IN THE CODE BELOW:

 private void Page_Load(object sender, System.EventArgs e) { try { //Implement your edit logic for your module if (!Page.IsPostBack) { //List<SDAPlayers> sdap = new List<SDAPlayers>(); ddlParentGuardian.DataSource = SDAController.GetParentDropDownList(); ddlParentGuardian.DataTextField = "Parent"; ddlParentGuardian.DataValueField = "ParentID"; ddlParentGuardian.DataBind(); ddlOtherParentGuardian.DataSource = SDAController.GetParentDropDownList(); ddlOtherParentGuardian.DataTextField = "Parent"; ddlOtherParentGuardian.DataValueField = "OtherParentID"; ddlOtherParentGuardian.DataBind(); } } catch (Exception exc) //Module failed to load { Exceptions.ProcessModuleLoadException(this, exc); } }